A doctor and Tang Jiu's roommate, described as calm, self-controlled, handsome, and steady. He is actually another transmigrator and is suspected by Tang Jiu to be the same person as Yan Yuchen from Tang Jiu's previous world, based on identical kissing habits (licking the little fang, sucking tongue, kissing upper lip). He confessed his feelings to Tang Jiu and was initially rejected. After getting drunk, he aggressively kissed Tang Jiu. The next morning he apologized and asked Tang Jiu to be his boyfriend, which Tang Jiu accepted. He is referred to as both Dr. Zhuang and Zhuang Huan in the text.
