Late at night, small-town delinquent Luo Chenchen walks past the master bedroom with a glass of water. Through the crack in the door come the creak of bedsprings and a woman's muffled, throaty moans. He leans in to look: his own father, Old Luo, is on top of Auntie Lin—who just moved in—both of them naked, thrusting away. Auntie Lin's legs are wrapped around his waist, and she's biting her hair, calling him "Warlord Xingtian." Luo Chenchen curses, "When did my dad go and bring home a whore?" His slipper squeaks on the tile; spotted, he flees back to his room. Through the door, Old Luo makes an announcement: from now on, call her Auntie Lin—and there's a new little sister too, named Yiyi.