Bei Baojun Jun Fu Qiangzhan Hou

Elias, a fallen demon prince, is forced to marry the irascible human monarch, Lancer, to save his two sons, Thor and Los. Unexpectedly, on their wedding night, Thor accidentally swallows poison, triggering a taboo stemming from his hybrid human-demon identity. Elias, seeking to detoxify him, accidentally triggers a forbidden technique, allowing him and Thor to merge souls. Between his timid 16-year-old human-demon son and his beautiful and noble demon companion, can Lancer see through their disguises?

(Source: Tencent, translated)