Had they only known that they are gonna be in comics! Shhh….
PS Do not get confused about the fact that in comics the girl is bule and the boy, on the contrary, Asian.
PPS As a help for the beginners:
If compared to English, Indonesians use a lot of abbreviations in bahasa, especially in chatting context. So it is very useful to know the basics of it.
In this case (and these are not the only ones for these words):
tdk – tidak
krn – karena
ku – aku
kan – bukan