HELP ME, PLEASE!!

It's a bl manhwa with older detective uke x younder blonde seme

In the 1st chapter, uke wants to resign his job as a detective as he was feeling down after his niece (his only blood related relative rn) got married and moved out of the house. Then he gets a call from his niece, in which she informs the uke about the seme (her childhood friend. Uke also treated seme like how he treated his niece. But seme had feelings for uke way back then) returning from abroad and needs a place to stay. So uke and seme starts to live together.

Uke, his niece, brother and sister in law got into an accident on a rainy day once (most probably a murder attempt. The logo of the truck which crashed into uke's family car and the company which is currently lead by seme's uncle are the same. Actually uke figured it out during investigation. Well, that'show i remember it). But his brother and sol died in that accident.

They got a lead for a drug related case ig?. I think seme is involved in it

I've been searching this for months.....but no luck ╥﹏╥

I can provide more details.
Actually when uke's niece and seme were younger, they got bullied by their classmate. So these two beat up the bullies. And their guardians are called to visit the school. That's their 1st meeting and that say uke taught seme how to shoot (a toy gun). Then seme honed his shooting skills and when he was about to enter Olympics. Seme's granny who was sick for a long time died. Seme raised by his granny and got nowhere to go. So uke took him to his house. That's when seme confessed to uke and uke rejected him. Then, seme went to abroad, where his uncle (his father's brother) lived.