On Cheng You Qing's (Ariel Lin) 30th birthday, she receives an email about "the symptoms of premature aging" from her best friend Li Da Ren (Bolin Chen). The two have known each other since high school and have been best friends since college. Li Da Ren is the one who understands her the most and believes that he is right: she needs to find someone before she ages more.
On that same day, Li Da Ren suggests a bet to pay 100 thousand to the one who gets married first. You Qing accepts the bet not knowing that the one who suggested it is the one who wants to love her deeply, but can't because he is afraid of losing her.
