Description：In 1998, Soo-jeong's parents got married with their two children. His father's eldest son Soo-gyo (played by Yoon Sang-hyun) is a gentle ethics teacher, and his second son Soo-geun is a student who dreams of becoming a policeman; his mother's eldest son Dong-soo (played by Song Shi-hee) is a bluffing tattoo artist, and his second daughter Hyun-jeong is a bad student who wants to become an artist. The two families formed a new big family, but because Soo-jeong's parents' children had different personalities, they lived their own lives early and rarely reunited. More than a decade later, Soo-jeong, who is already a middle school student, discussed with her mother and used her parents' illness as an excuse to trick her brothers and sisters to go home to celebrate their parents' wedding anniversary. While the children rushed home, their parents disappeared unexpectedly, so the five brothers tried hard to search according to the clues left by their parents, but accidentally uncovered one of the vicious cases in Deoksu-ri.