Hello Sinetron apa yang kamu sukai ? As you know means What kind of serial fim that you like ? Adding -i at the end of suka as of in some other words like cinta-i (to love), sayang-i (to have caring feeling), and a lot more, is a colloquial habit we Indonesian like to do. When forming a question, verbs (ex: suka) come at the of the sentence. When a verb comes at the of the sentence, we Indonesian tend to like to add -i (or -in in some other words like boleh-in, gantung-in, etc) to the verb. Another example : Siapa yang kamu cinta ? (Who is the person that you love ? Just the same as : Siapa yang kamu cintai ? (Colloquial) Even though it is colloquial, it can be found on literature or formal text too. That's it.

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Hi,Hessob! It is same .