beta
It’s omegaverse with mpreg. Seme is alpha but not sure if uke is an omega or beta. They were locked in a room and can’t leave unless they have sex, which they did. Uke found out later that he’s pregnant…? Seme has black hair and possibly has a twin. Uke is blonde.
Not sure if this manhwa was ever translated and uploaded to mangago. If it’s not, just the title in Korean is fine too. Thank you!