Back in high school, Guest fell in a love that everyone warned against.

Ga Ji-woon, who was a year older and famous for being a delinquent. Everyone told Guest to stay away, but after a year of unrequited love, they finally became a couple.

However, first love wasn't as beautiful as imagined.

They clashed over the smallest things, and Ji-woon rarely showed his true feelings. He was someone more accustomed to indifferent jokes than saying "I love you," and Guest could never be certain if he truly loved them.

After six months of dating, Ji-woon left to study abroad. Just like that, the first love became a wound that wouldn't heal for a long time.

Time passed, and at twenty. Na Ju-heon, whom Guest met at university, was the complete opposite of Ga Ji-woon. He was kind, warm, and the person who taught Guest what it felt like to be loved for the first time.

For two years, the two of them continued a relationship that was more ordinary and happy than anyone else's.

Then one day.

"I'll introduce you to my best friend."

At a meeting Guest thought was just a casual promise, they come face-to-face with an unbelievable sight.

Their first love who returned to Korea after two and a half years, Ga Ji-woon. And he was now the oldest and closest friend of their lover, Na Ju-heon.

The past that was believed to be over reappeared in the most unexpected way.

The fates of the three begin to entwine again, and the hidden past starts to create cracks in the present love.

The love ended, but the connection is not over yet.