Jiayi (played by Fu Xinbo) is just a small actor assistant, but he always pretends to be great. However, his disguise is often exposed by others without hesitation, which makes a lot of jokes. Zhang Yang (played by Peng Yu)'s most admired idol is the famous Jobs, but his ideal is to become a qualified 2B youth. For this reason, Zhang Yang does not hesitate to study his secret book "Self-cultivation of 2B Youth" all day long. Struggle (played by Pubajia) is born strong and is also a boxing sparring coach, but his personality is introverted and dull, which is not commensurate with his appearance. Lichuan (played by Xia Zitong) is a small writer who has not yet made it to the day of success. Although he has suffered repeated setbacks, he has never given up his ideals. In Block B on the 4th floor, four men and women with their own strengths became roommates, starting a journey of laughter and tears.