Ji Xiwen lives under someone else's roof, but unexpectedly finds herself drawn into Chi Sui's world. The sharp-tongued yet soft-hearted young master remembers all her preferences and buys her teddy bear cakes, and he offers her his jacket in a torrential downpour. When the whole world teaches her to be sensible and considerate, he is the only one who tells her, "You can use up all my patience as you please." This summer, a secret crush with the taste of green apples quietly ripens, and the girl who has always depended on others finally discovers a heartbeat of her own. It turns out that being someone's favorite is sweeter than she ever imagined.