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.
Mi-so and Ha-eun meet in elementary school and quickly become best friends. In high school, Ha-eun meets Jin-woo and starts to have feelings for him, but he starts to have feelings for Mi-so. When they all meet again as adults, they are very different people, but they try to remember what friendship is really about.
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.