Kim Do-hyun - As I explained earlier, a tutor who helped me with a coincidence when I was 20. He was also a sub ball of the author's previous work called <Omega Complex>. So, if you saw Omega Complex first, sharing your view of the world feels interesting. Especially since the karate of the Omega Complex appears from time to time. It feels sweet and mature. As someone who read Omega Complex, I felt much more mature than Dohyun, who was 20 years old. Basically, because he was in a soft and friendly position, he was a character that he liked very much as a sweetheart. 

*Omegaverse
Ps. This isn't my review, i just copy paste it for yoy to have a knowing about Kim Dohyun's story.

Sun Woo-yeon (Wednesday)-  He is the son of a wealthy family born to an Alpha mother and an Omega mother, but he hates that fact because he grew up alone and under the control of his mother. When she was severely bullied in middle school, her mother realized that school life was not going well, so she appointed Do-hyeon to Woo-woo as her tutor. As Do-hyun takes care of the wounded coincidence, the 16-year-old coincidence seeps into the 20-year-old Do-hyun. However, since it is a dominant omega, if the pheromone control is wrong, the alphas will attack and dislike the alphas. Also, because the children who bullied her were also Alphas. So I asked her favorite tutor, Dohyun, if she was an Alpha. The answer that came back was a question of whether it looked that way. Woo-woon replies that Do-hyun is not like an alpha. However, after confessing to Do-hyeon and being teased, Woo-yeon gets hurt and goes to study in the United States. virtually escape. There, Woo-woon loses about 30kg and returns to Korea to enter a university, where he meets Do-hyeon, who attends that school.

If you're talking about Kim Dohyun, he's got another story entitled "Alpha Trauma".
BL NOVEL:
Alpha Trauma
Author: 오늘봄
Alpha Trauma is a Biel novel with an Omegaverse universe. It is a story about Woosung Omega, who hates alphas, and coincidentally reunites with Alpha and former tutor Do-hyeon at university.

Yoonseul has the right to be possessive towards kang joon especially when Dongha doesn't know when to stop. He's trying to send a hint to Dongha to stop coming after his man. Yoomseul's possessiveness isn't even too extreme, he wants to punch the fck out of Dongha but choose to stay calm for Joonie. If my boyfriend has a co-worker like that i'd be mad and become possessive too.

Wdym this is traumatizing? They should've take a peek at my bookmarks