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The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised. “What?! I'm supposed to be the guardian of this tentacle monster?"In a research facility specializing in monster biology, Monster Veterinarian Doha finds himself under a slimy assault from a pubescent tentacle monster.During this encounter, the tentacle monster comes to recognize Doha as its 'maternal figure,' and he ends up becoming its guardian for a year, taking on the responsibility of its training.However, controlling this tentacle monster, which has an insatiable sexual appetite, proves to be nearly impossible on his own. Eventually, for safety reasons, he is introduced to Kyunghwan, the son of the research facility's director, as his partner."Dr. Yoo, if it's okay with you… May I assist with the training?"

In the world of modern omegaverse, Haejin is an average office worker with a spirit of adventurer who happens to be the omega that Hwan Lee, a sharp-looking and ambitious corporate executive has been searching for. Hwan, who needs a matching omega with a sufficient compatibility rate in order to have him bear his child, offers Haejin an overwhelming deal that is too sweet to be rejected.