Based on the level of respect or formality, you can say "I think I like you" in Korean in 3 ways:
Informal: na-neun neo-reul joaha-neun geot gatta (나는 너를 좋아하는 것 같아) - na-neun can be omitted.
Formal: jeo-neun dangsin-eul joaha-neun geot gattayo (저는 당신을 좋아하는 것 같아요), jeo-neun dangsin-eul joaha-neun geot gatseupnida (저는 당신을 좋아하는 것 같습니다) - jeo-neun can be omitted.
Very Formal: jeo-neun dangsin-eul joaha-neun geot gatseupnida (저는 당신을 좋아하는 것 같습니다) - jeo-neun can be omitted.
- I: na-neun (나는), jeo-neun (저는) - to think: saenggak-hada (생각하다) - to like: joa-hada (좋아하다) - you (objective): neo-reul (너를), dangsin-eul (당신을)