The movie "Can I Return My Brother?" tells the story of a good-for-nothing brother, Cha (Sunny), and his model student sister, Jen (Yaya), who have been fighting since childhood. However, he is so rude and useless that he cannot get the upper hand in front of his excellent sister. He only enjoys making fun of his sister, especially when his sister is in love. He often puts on the airs of a brother to show off his power. This time, Jen tries hard to develop a relationship with a handsome Japanese-Thai mixed-race boy, Xiao Bing (Nikhun), but Cha is dissatisfied with his sister's choice and decides to make fun of the couple! How should Jen, who is determined to defend her love, respond?