By telling Triss you love her you’re in her romance, later on in the game there is a side quest you can do with Yen where you can tell her you love her to seal that relationship. If you tell them both you love them you get a not so great cut scene near the end of the game.

That’s because we as English speaking servers only see the English. It’s not like the Chinese server has all of their Riot posts, announcements, and customer support in English. Riot is a big company, they have people that speak every language they have servers in, and i believe that they have a HQ in every…