Amidst the most severe flood Bangkok has faced in 50 years, a twist of fate brings together Thung (Rattapoom Tokongsap), a grumpy office worker at Index, and Mei Sui (Natthaphatsara Adulyamethasiri), a bold and beautiful account executive (AE). Their meeting is orchestrated by Thung's mischievous friend, Sang Mong (Attapong Attakijkul), who ropes them into joining a volunteer group—initially as an excuse to meet girls.

At the volunteer site, they encounter Sui and Bua (Benjarat Wisitkitkarn). Sang Mong instantly falls for Sui, but Sui takes an immediate dislike to Thung, even mistaking him for a creepy stalker. The misunderstanding deepens, despite the fact that Sui and Thung happen to live in the same neighborhood and cross paths regularly. What follows is a series of comedic and heartfelt encounters that bring their lives unexpectedly closer together.