Do you mean "Rinka then thinks of that K"? There is no reason to suppose that this is meant. "that K" is possible in the sense of something like "that person called K who was mentioned earlier", but if the author had wanted to say this then he or she would have done so.
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park sang joonThen I was wondering if a relative pronoun "who" is omitted before "sends."There is no need to assume that. (though it would not be wrong to insert it).
park sang joonThen, I was wondering how "think of" can lead a clause as in my example.Which example are we talking about now?
park sang joonI thought he is called K."K" is probably his initial (the first letter of his name).
park sang joonK or K.I don't understand what yo