Best answer
私はあなたを参照し、美しい人だと思います。 （jeo・neun dang・shin・eul cham ah・reum・da・eun sa・ram・ih・ra seng・gak・hab・ni・da）= I think（believe）you are very beautiful person to me
美人（美人）ですね（mi・in・ih・si・ne・yo）= you are a beautiful person美男（美男）ですね（mi・man・ih・si・ne・yo）= you are a handsom man美女（美女）ですね（mi・nyeo・ih・si・ne・yo）= you are a beautiful lady
きれいですね（ye··bbeu・si・ne・yo）= you are pretty（normally to a female）
実物の方がきれいですね（sil・mul・ih deo ye・bbeu・si・ne・yo）= I guess you are more beautiful in reality = You are more beautiful than the photos
Slangジョンジャル（jon・jal）= really F handsome – for Boys only（very informal、only between friends）ジョンイェ（jon・jal）= really F beautiful – for Boys only（very informal 、only between friends）イ뿨〜（eeh・bbppoua）= PRETTY〜！
Answer
It “s hard to find an exact word to convey that aggressive sense of shock that WTF has but I “ll give a few that might work：
何はでたらめだ？ （Mwon Gae-so-ri-ya？）
Meaning what dog-sound is this？ Conveys the loss of words one feels when faced with some idiotic statement。
… …笑（…… lol）
That passive aggressive lol seems to give off that sense of WTF although in a more sarcastic way。
ハル（Hul）
This is kinda of like that whoa or wat that we use when we “re surprised、and can be quite neutral。use it in the right texting context or put in a deadpan tone though、and you “ll be able to hit the right image of WTF。
ギガ混ん（Gee-ga Mak- hee-né）orちょっとね（Oh-ee Obs-né）
it doesn “t have that exact sense of shock WTF has、but rather the speechless aftermath after it。it” s basically words that mean「I」m so stunned by this stupidity in front of me that my energy has been stifled / I can “t speak 。
何クレイジー（Myo-ya Mee-Cheen）
Basically the two words」What is this」and「Crazy！」。 Closest to the the WTF I could think of、to be honest。 Plus、you can always exchange the Mee-Cheen（crazy）in the back with」始発「aka Shee-bal（A swear word that would give a more aggressive WTF）or 大当たり」aka Dae-bak（An」amazing！」 that would give it a more OMG connotation to the WTF）。