Isipse

Lee Hyo-Min, the very embodiment of debauchery, relying solely on his looks to secretly throw parties while his wife is away. One morning, suffering from a hangover as usual, he encounters his new son, Choi Hyuk, for the first time in ages. Just as he marveled at how quickly his child had grown, with this unfamiliar build and expression, Hyo-Min felt strange after drinking the water Hyuk offered him. Only then did Hyo-Min notice the unnatural glint in his son's eyes...

“I bought this because you drink this stuff often.”

“It's only natural for a father to love his son.”

(Source: MrBlue, translated)

Note: Includes two extra chapters.