좋아하다 means to like , 좋아해요 (해요) is informal polite speech , 좋아합니다 ( 합니다 ) is formal speech, if you want to ask someone whether he/she likes them or not you can say BTS를 (방탄소년단 을) 좋아하니까? and it's a formal way to ask but if you're speaking with a friend or someone close you can drop the 을/를 ( when you are speaking only! ) if you are going to write it you should put the object particals you can say BTS 좋아? or BTS 좋아해요? 좋아하세요 too can be used to ask someone the only difference between 좋아하세요 and 좋아해요 that 좋아해요 can be used to talk about yourself too 제가 방탄소년단을 좋아해요. ( I like bts )

좋하세요 is honorific speech 좋아해요 is polite speech 좋아합니다 is formal speech They all have the same meaning Yes “BTS을 좋아해요?” Would be correct 우리 엄마가 BTS을 좋아하세요 Our mother likes BTS 제 친구가 BTS을 좋아해요 My friend likes BTS 우리 사장님이 BTS을 좋아합니다 Our Boss likes BTS Its also common to say "it is good" for me him her using the adjective 좋다 instread of the verb 좋아하다 저는 BTS가 좋아요 I like BTS 우리 엄마가 BTS가 좋으세요 My mother likes bts 나는 그 남자가 좋아 I like him (to me he is good) 나는 이 책이 너무 좋아 I like this book so much 으/시 is honorific languages very common with elderly people. You can speak casually to a friend while still honoring someone you talk about to them for example "우리 할머니가 돌아가셨어" "amy grandmother passed away"..theres no 요 ending meaning no need to be polite to the listener but the grandmother is the subject doing the actual verb so honorifics is used for that verb. 돌아가다 means ro return, in this case to pass away

좋아하세요? is question 좋아해요 is an assertive sentence or question 좋아합니다 is an assertive sentence you can say 방탄소년단 좋아하세요? or 좋아해요? or 좋아해? you don't need to add 을