Okhee is a lower-class diver in the city. One day, Eunyoung, the daughter of her late husband, comes to visit. What’s more, Kyeongsik, Okhee’s son, who is being chased by creditors, leaves his young son Junseo with them and disappears. Eunyoung wasn’t planning to stay long but misses the chance to leave due to Okhee's accident and the appearance of her step-nephew, Junseo. Eunyoung starts to live together with Okhee, but everything feels uncomfortable.