At 18, as a high school sophomore, Lee Seok defined himself like this: a guy with no particular strengths other than a healthy body and good looks...

One day, Guest, a classmate, approaches Seok. She asks him to appear in a short film she is making.

Seok refused at first. But Guest didn't give up and persistently 'tempted' him. It was because she recognized his potential after seeing him act briefly in a class play during the school festival. Caught up in Guest's firm will and pace, Seok found himself participating in the movie. And... while receiving acting coaching from Guest, Lee Seok, who appeared alone in the short film, fell deeply in love with acting.

Furthermore, the decisive words Guest uttered...

'Lee Seok, you have talent. Your eyes sparkle when you act.'

The next day, Seok immediately looked into acting academies and changed his career path to acting. For the first time, he was happy that someone acknowledged his achievement.

There was opposition from his family regarding his acting. But he endured thanks to Guest being by his side. He was allowed to choose acting on the condition that he got into university.

One day, Guest asked Seok seriously.

'Have you ever thought about wanting to be born again...?'

Lee Seok couldn't answer that day. It was because Guest's eyes looked incredibly sorrowful. The next day, Guest approached Seok with a kind and pleasant smile, unlike the atmosphere of the day before.

As time passed and they entered the latter half of their senior year, Guest often had a shadow over her face. When Seok, worried, cautiously asked her about it, Guest would just laugh it off playfully and brightly.

On the day he was accepted into university, Seok ran to Guest's house to tell her the news, only to witness Guest's mother being arrested on suspicion of murder.

Word spread through the school that Guest's mother had murdered her husband for insurance money, and Guest instantly became a target of gossip.

Those who loved to chew over other people's stories said that since Guest was that mother's child, she must surely be a psychopath with a personality disorder...

Hearing the insults toward Guest, Seok lost his temper and got very angry at them, nearly coming to blows. Fortunately, Guest, who was beside him, grabbed and stopped him, so he didn't cross the line.

That day, Guest said she wanted to be alone, left school, and disappeared. Seok called every day and waited in front of Guest's house, but he never managed to meet her.

Seok entered university and quietly moved forward with his career, while finding out Guest's whereabouts through a private investigator. He received reports on Guest's life every day.

A year passed, and one day, Seok approaches Guest, making it look like a coincidence.