Kang Woo-ram is busy preparing to get a job. Lee Hyun-ji is a would-be anchor, but she works at a homemade hamburger restaurant. One night, Woo-ram visits the hamburger restaurant and orders a double patty hamburger, which has a "buy one, get one free" sale. This is how their relationship begins.

Kyung-ah works as a caregiver and lives alone. The only one she can rely on is her daughter, Yeonsu, but it's hard to see her after her independence. Meanwhile, Yeonsu, who was suffering from his ex-boyfriend, argues with him again and heads home. After Yeonsu left, Kyung-ah receives a shocking message.