I remember this novel, its bl, omegaverse(ABO) Omega had a one night stand with the alpha(perhaps due to the alpha's heat), then escaped. (maybe the omega left something behind? that the alpha picked up?) the alpha then searches for the omega. that kind of story. I think this plot was for the side pairing. it would be nice to reccomend me more novels with this kind of plot! or something that is close enough!
Sounds like Runaway Guide, the parents of the MC's omega bestfriend was like this~~ Only its the Omega that suddenly went into heat, not the Alpha. But yep, its the Omega that escaped.
If you like something similar 帝后之路 mtl title: The Empress Set in interstellar era, sentinel/guide. (<- I never did understand the difference between omegaverse and sentinel/guide....) After his half brother flees from the arranged marriage, MC (shou) replaces him to marry the invalid crown prince. MC has his own agenda to revenge his mother and schemes all the way to destroy his father's family. MC and ML met at a very young age, and MC’s goal was to marry crown prince due to his love. Completed with 100 chapters (Raw). So unfortunately, you'll have to mtl the raw, but i thought it was readable? *cough cough* my english standard has dropped considerably at the same time now that i've started to mtl LNs... >.>