Six months ago, Jin Sang-chul (Choi Moo-sung) and Lee Mi-sook (Kim Yeo-jin) lost their son Eun-chan who drowned while saving one of his friends, Yoon Gi-hyun (Sung Yu-bin). One day Sang-chul meets Gi-hyun. Upon learning that he has been abandoned by his parents and also recently lost his job, Sang-chul offers him a job to work for his small company. Mi-sook initially is very cold towards Gi-hyun but gradually opens up to him. Feeling guilty about what had actually happened to Eun-chan on the day he died, he reveals the shocking truth behind Eun-chan's death.