Ranmu has lived with his mother since he was a child. His mother, Tang happy, pulled the burning wood and waited for the man who was imprisoned for nearly twenty years. Gradually, Tang happy mistakenly regarded Ranmu as his man and opposed him finding a girlfriend. After going to college, Ranmu was very distressed and met "Cinnabar Mole" on the Internet. The two of them had a great conversation. Later, Su Tai, who helped her roommate chase her boyfriend, ended up being self-defeating and ended up with Ranmu. When Tang happy learned of this, he threatened him with death. The naive Su Tai couldn't stand the threat and left. Ranmu thought Su Tai was ruthless and quickly threw her away. Later, in an elective course, Ranmu saw "cinnabar mole" for the first time.
"Cinnabar Mole"'s real name is Xia Liang. She doesn't like to wear underwear and has small breasts like flower buds. She is a very special kind of girl. The two established their relationship at a music party. Later, Ranmu discovered that Xia Liang was a girl with a story, and was not as innocent as she seemed. He thought he had been deceived and began to feel disgusted. In addition, Xia Liang was drunk and he reached out to hit her, which made him even more powerless towards this relationship. Tang happy learned that she rushed to school and went directly to Xia Liang with Ranmu on her back, telling her that Ranmu had slept with many girls and threatened her to leave. Xia Liang and Ranmu discussed deceiving Tang happy and lied to her that they would break up. Tang happy believed it temporarily.
Ranmu began to be harsh on Xia Liang and became suspicious. Xia Liang gradually became disappointed. At this time, she met Yang Yu. Yang Yu is a big boy who is opposite to Ranmu. He begins to take good care of Xia Liang carefully. Ranmu was jealous, the two had a conflict and proposed breaking up, but Xia Liang gave up. At this time, Tang happy learned the truth and thought they had not broken up. She went to find Xia Liang and slapped her in the street. Xia Liang did not fight back and publicly exposed the fact that Tang happy's mother and son were in love.