From an incident when he was 18 years old, Wei Qing develops a severe case of OCD which stops him with interacting with anyone without getting an allergic reaction. Wei Qing has been searching for years for someone who he is immune to so that he can be cured. Ten years later, Wei Qing is saved from drowning by an 18 year old arts student called Zhou Shi and discovers that she doesn't affect him. Wei Qing then begins to pursue Zhou Shi.