'I didn't care if the place I crash-landed was hell. As long as it wasn't a traditional outhouse.' In an era when hot showers were a world away, the people he encountered carried swarms of lice and nits in their hair, and every place he went was crawling with black fleas. The year 1938 welcomed him, a man who is 'surprisingly a clean freak,' with shocking sanitary conditions. Furthermore, there is no Wi-Fi. No mint chocolate ice cream. Above all, his beloved Ji-ah is not by his side. 'I must return. To the place where I lived.'

However, everyone and everything is holding Lee Yeon back. A woman who loved him to death. A friend who was once closer than anyone. And his lost brother, Lee Rang. To the Lee Rang he meets again, Lee Yeon does not tell the truth that he came from the future. Nor the fact that they became brothers again. 'Keep hating me. If you open your heart, you'll get hurt. Don't... ever die for me again.'

Actually, Lee Yeon never properly saw the scenery of colonial Gyeongseong. Because in those days, he was an opium addict. To make up for his dark past, Lee Yeon throws himself resolutely into the turbulent waves of the era as the 'last Mountain God' of Joseon. The Governor-General's counterattack was formidable, but there is one thing they overlooked. In an era where he has 'no lover to protect,' he is far more ruthless than the man we know.

It is finally time for the hunt.

He became enemies with his brother and wandered the mountains and fields like a living corpse. Someone attacked Lee Rang. It was a band of brigands—wolves who had lost their homes and transformed. Of course, the bandit leader who made the mistake of touching a depressed half-human, half-fox had his head taken off in a single stroke. 'I'll turn you all into vulture food.' Yet, those who lost their leader are now kneeling before Lee Rang?!

Thus, Lee Rang lived through the 1930s as a bandit leader. He became a cold-blooded killer, to the point where rumors circulated that not even a corpse remained where they passed. Then, the brother he hates to death appeared before him. 'Die!!!' After a blood-splattered battle, he is dragged to barbershops and boutiques by Lee Yeon, reborn as a quite fashionable modern boy. However, in Lee Rang's eyes, the identity of the 'Lee Yeon by his side' is nothing but suspicious. He finds out later—good heavens!! He came from the future. 'Am I alive in the future? What kind of state am I living in?' For some reason, a deep sadness flickers in his brother's eyes.

Indeed, what will be Lee Rang's fate?

The mysterious Red-and-White Mask who stole the 'Samdo River Guardian Stone' and fled to the past. He is also the one who trapped Lee Yeon in 1938. With martial arts skills that don't back down even in a full-scale war against Lee Yeon, excellent medical skills, and the ability to control 'fire,' what is his true identity behind the mask?!

Former 'Mountain God of the North.' His true form is a Baekdusan tiger. In the past, he was known as the gentlest among the four great Mountain Gods. He was a man who cherished every living thing, even a single blade of grass. But now, Mu-young has changed. He uses people cruelly, turns them into monsters if necessary, and even slaughters Lee Rang—if only he can catch Lee Yeon.

Only one thing makes him weak: 'Hong-joo.' Mu-young was always looking at Hong-joo's back. Hong-joo was always looking at Lee Yeon. She only looked at Lee Yeon. Still, Mu-young loved them both and cherished them equally. Because once, the three of them were 'inseparable friends.'

Why is such a man targeting Lee Yeon? 'From friends to enemies.' An unavoidable showdown awaits these men who know each other better than anyone else.

He came from the future with Lee Yeon. Not only was he conscripted at the same time as the time slip, but he also had his entire fortune stolen by some bandits. After all sorts of hardships, he returned to Gyeongseong, but Gyeongseong was vast and Lee Yeon's whereabouts were unknown. He barely survives as a delivery worker for a cold noodle restaurant, but is it just his imagination? He feels like he saw Lee Yeon-nim during a delivery?! He protects a human woman who looks exactly like his wife (Ki Yu-ri, a Russian fox) and helps her with the independence movement.

An independence activist and explosives expert hiding her identity. Though she is the daughter of a famous wealthy man, she became a member of the Liberation Volunteer Corps after her only older sister hung herself after being married off to a Governor-General official. Thanks to this, she becomes a witness and a party to all sorts of incidents and accidents, getting entangled with Lee Yeon's group.

But 'Who are these people and why are they so desperate to protect me?' Eun-ho doesn't know. That her face looks strikingly similar to Shin-ju's wife.

The leader of the wolf pack within the bandit group following Lee Rang.

In the past, Lee Rang was not the leader, but after the head of the previous bandit group who mistakenly touched Lee Rang was decapitated, he entered under Lee Rang and continues to act as a bandit.

Myoyeongak, the highest-class restaurant in Gyeongseong. They say there is a woman here about whom strange rumors circulate that she 'does not age.' A truckload of men suffer just to try and win the heart of this peerless beauty and unparalleled artist.

However... 'If you can beat me in a drinking match, you may have this girl.' Where does the alcohol go in that slender body? She is a heavy drinker that even several grown men cannot defeat. It is likely no coincidence that her name contains the character for 'alcohol' (Ju). Furthermore, though no one knows, she is the possessor of immense Herculean strength.

Hong-joo's identity is one of the four great Mountain Gods who ruled the Korean peninsula along with Lee Yeon. Her true form is a Eurasian eagle-owl, a natural monument and Class II endangered species. The reason this large bird of prey, called the king of the wild, settled in Myoyeongak: 'Ah... I'm bored. Isn't there anything fun?' She has broken every taboo of a Mountain God and has been sentenced to hell by Taluipa more than once or twice. Though surrounded by crowds of people, she doesn't have a single friend. This is due to her creed of not making friends with 'things weaker than me.' In truth, she might have been a little lonely.

Suddenly, life returns to her eyes. 'Lee Yeon?!!!' Long ago, from the first moment they met, she told Lee Yeon, 'You, be mine.' And she was rejected. She was furious to hear the rumor that the incredibly haughty Gumiho had fallen deeply for a mere human woman. But Lee Yeon appeared at Myoyeongak of his own accord?!! She is a woman who never lets go of what she has once targeted.

If he cannot be mine, I will kill him.