Pau's Questions (2)

I AM LOOKING FOR A BL MANHWA.

So, back when I was still new in the comic world (especially BL), I've read this BL manwha before (and I meant years ago). BUT I CANNOT RECALL THE PLOT, NOR WHO THE CHARACTERS WERE.
The only thing I can remember was that Yu Yang and Li Huan from the BL Here U Are appeared in that comic. They were neighbors with the character from that comic, and I think Yu Yang and Li Huan were already living together with Dodong (the dog) as well.

I realized I have forgotten what the manwha was when I finished reading Here U Are (also like years ago when I finished it) and recognized Yu Yang and Li Huan from before.

Someone please help me find the manhwa. I have no more information about it except Yu Yang and Li Huan appearing in that comic ╥﹏╥.

This is all for my own peace of mind since it torments me almost everyday, trying to recall what the comic was.

Thank you.

I forgot the title, it's BL, and it's about a white-haired, blue-tailed merman (Ω) and a black-haired, white lion-man (a) or something like that. The merman came from a lab and the lion-man is part of an organization, like agents and stuff. I just remember the part in the story where they said a mermaid's tail can be so long if they are repeatedly cut, which happened to the merman while at the lab.

Please help me find it. If only the tragedy of losing my reading list hadn't happened ╥﹏╥ Thankyou!