Were you lonely and tired, Mother-in-law? I'll relieve both your body and mind~ Yunmi, who lives at her boyfriend Kwangsoo's house, is suddenly visited by her mother, Jeongah. Jeongah, who left her home after divorcing her husband due to his infidelity, asks Yunmi to let her stay for a while, and Kwangsoo agrees. Yunmi, who had planned to break up with Kwangsoo to meet her new boyfriend Cheolho, postpones the breakup because of Jeongah, but they break up soon after. To appease Cheolho, who is rushing her to break up, Yunmi leaves the house under the pretense of a business trip, leaving her mother and boyfriend alone. Jeongah, who was lonely due to her husband's affair, and Kwangsoo, who was lonely due to Yunmi's excuses of being busy. Eventually, the two get together. When Yunmi goes to inform Kwangsoo of the breakup due to Cheolho's insistence, she witnesses their intimate moment, gets angry at Kwangsoo, tells him to break up, and leaves the house.