When Mi-so and Ha-eun first meet in childhood, their lives become instantly intertwined, forming a bond surrounded by happiness and naivety. But as adulthood arrives, alone and together, they are forced to deal with sadness, anger, grief, growth, and most of all, love.

Sang-hyun is always struggling from debt, and Dong-soo works at a baby box facility. On a rainy night, they steal the baby Woo-sung, who was left in the baby box, to sell him at a good price. Meanwhile, detectives were watching, and they quietly track them down to capture the crucial evidence.

After spending a decade in prison, a hitman learns that he has a daughter and just wants a chance at a normal life. But his former mob boss wants him back at any cost, sending merciless assassins after him.

After being laid off and humiliated by a ruthless job market, a veteran paper mill manager descends into violence in a desperate bid to reclaim his dignity.