B East 401

Every night, Tang Yining stayed up all night. Wythe, a psychology boy who lives in Building B 401, said he wanted to help her cure her insomnia, but before her insomnia was cured, he already fell in love with her. The boy's roommate Tan Tianming also fell in love with Yi Ning. When she went to work part-time at a convenience store, he always stayed by her side. Through Wythe's efforts, the mystery of her insomnia was slowly solved. Can she sleep at night, and where will her love end up?