Please recommend me a BL manhwa with a mc that looks like Ivan from alien stage. Looks or ...

Looks + personality : like stoic with an obsessive side personality wise and looks wise black haired
From most similar to somewhat similar order -

Blaze Out
https://www.mangago.zone/read-manga/blaze_out/

A Link Between Relationships
https://www.mangago.zone/read-manga/a_link_between_relationships/

Checkmate(TAN) - ml is not similar lookswise but I feel like they give off kinda same personality vibes
https://www.mangago.zone/read-manga/checkmate_1/

Unluckily Lucky
https://www.mangago.zone/read-manga/unluckily_lucky/

Park Hanhoo's Manager
https://www.mangago.zone/read-manga/park_hanhoo_s_manager/

Tiger and Tiger Gourd
https://www.mangago.zone/read-manga/tiger_and_tiger_gourd/

The Promise
https://www.mangago.zone/read-manga/the_promise/

enjoy (｡•ᴗ-)✧