Gio

So, there's this uke who's in college, and he suddenly runs into his brother-in-law or his sister's husband’s younger brother. They live together with the brother-in-law (I can’t remember why, but the uke has to leave his apartment and ends up living with him since he offered).

Out of nowhere, the brother-in-law proposes to him, saying he’s here to pick him up now that he’s of legal age. When the uke was a kid, he was sad during his sister's wedding and wanted to be close to his sister. The bro-in-law suggests they get married so the uke can stay connected to his sister, and the uke agrees to it, even though he was just a kid back then.

He doesn't really remember much, and it feels kinda weird since the bro-in-law is about 10 years older than him. But he doesn’t have much of a choice since he’s low on cash for living expenses.

Uke: He was short, light hair, looks cute with big eyes.
Seme: Has black hair, is taller, and is a rich worker, haha. (=・ω・=)

Please help me find this BL manhwa title,
Genre: YAOI, Supernatural, Smut, comedy.
Characters :
(Bottom/MC): yellow hair, white skin
(Top/ML): Black hair, white skin, taller
Note: there is a second couple, their characteristics.
(Bottom): pink hair, white skin, petite.
(Top): Brownish black hair, dark skin(?), big and tall body, scary face [looks like a mobster].

The plot I remember is about, a famous shaman (Bottom) who has a guardian genie / khodam of an ancient Korean war general, who always tells the truth when serving his clients. However, one situation made this shaman unable to contain his Yin energy, so he was often attacked or molested by the surrounding ghosts. Then, this shaman accidentally did something that made himself possessed by the demon Incubus. The shaman's Yin energy made his body hot and desperately wanted to have sex with someone, so the guardian genie / chodam could not do anything. This Incubus demon influenced the Shaman until the Shaman (bottom) met a man (his Top) who came from the shaman's clan house(?), this man was like a young master in the place he was in, this man also had quite a lot of Yang energy, but this man could control his own Yang energy. This man helps the shaman (bottom) by having sex when necessary. And the two of them tried to exterminate the Incubus demon together.