Family Mate
One night, Kwon Yisoo somehow mistakenly become the sex partner of a superior he hated, Han Gangjin. Kwon Yisoo tries to break all ties with Han Gangjin but during a meeting for his mother's remarriage, he meets him as stepbrothers. He tries to get himself together but because he'll be living with Han Gangjin, Kwon Yisoo can't help but get pulled in by him.
Love or Hate(Yeongha)
Haesoo and Joowon, whose parents' remarriage meant that they must never be in a romantic relationship. Through repeated partings and encounters, fights and their senseless forsaken relationship in bed, changes began to take place as Taekyung came in between the two of them.
PLACEBO: Let's Play
This going to be messed up. All Seo Woo-yeon wants is a simple university experience away from his intensely annoying step-brother, Woo-jin. So imagine his frustration when Woo-jin not only gets into the same university as Woo-yeon, but also follows him to the same major and even the same classes! Woo-yeon’s determined to make the world see how awful his brother truly is, but…well, his memory has been really spotty these days and, to top things off, Woo-jin seems to be acting even more smug than usual. Just what is going on in the times Woo-yeon can’t remember, and what does Woo-jin have to do with it?
Haven
They are step-brothers without blood related. The alpha is so possessive and the omega fishy too. Both of them toxic in their own way. The omega is cute but strong and I love they not losing their mind while in heat/rut.
Eunsoo's Good Day
Eunsoo runs a flower shop with his mother. But one day his single mother told him that she had a boyfriend with marriage plans in mind. Furthermore, his mother's boyfriend has twin sons. Unexpectedly, the twins who were his soon to be little brothers, upon their first meeting treated Eunsoo with utmost kindness and try to make forbidden physical contact with Eunsoo. Uke such a pushover.
Unholy Night
On Christmas Day, 14 years ago, Joonyoung and Eunhyuk became step brothers after their parents remarried. However, their parents soon passed away in a car accident and Eunhyuk became the only person Joonyoung could depend on. To Joonyoung, Eunhyuk was the perfect guardian as well as savior. But upon a certain incident, Eunhyuk's existence took on a different meaning to Joonyoung. That incident had Joonyoung leaving Eunhyuk's side as if he was running away, and now that 6 years have passed, he ends up reuniting with Eunhyuk at a hotel. As Eunhyuk, who had desperately looked for Joonyoung, finds and warmly hugs his little brother, his eyes show nothing but iciness unlike the warmth of his embrace...
Breath The Same Air
Haesin, who moved in with his ex-stepbrother who said... after 10 years. Sang-heon, who breaks down the house whenever he has time, and a perv, Haesin, who is amazing at cooking, live together in romance! Can two people live peacefully in the same air? Chap 30 : why they're so short tempered?!!! Please communicate nicely urghhhhh. Terrible ending. I really fed up with their hot heads.
Binding of Unrequited Love