Dropout girl Su Ruanruan encounters a mysterious amnesiac man and recognizes him as her step-older-brother from different parents. Who would have thought that the picked-up older brother is not only not a burden, but after losing his memory still comes with elite straight-A student genes, directly kicking off a transformation plan for Su Ruanruan! Forcing tutoring in math, physics, and chemistry, ordering her to dye her hair back to black, and morning English brain-washing sound immersion, the two bicker and match wits every day. Amidst the quarrelling, bonds gradually grow, but the man's hidden true identity could shatter this absurd yet warm rental house daily life at any moment!!