I think.... this is the first time Kang Moo experience jealousy and he doesn't understand what is happening to himself. For Kirin, he didn't know Kang Moo are capable to feel jealousy. He's just annoyed at how Kang Moo are treating him eventhough he tried to explain that he is so in love he would rather die than leave. Unfortunately there is no way Kang Moo would under because he cannot feel love.
I think.... this is the first time Kang Moo experience jealousy and he doesn't understand what is happening to himself. For Kirin, he didn't know Kang Moo are capable to feel jealousy. He's just annoyed at how Kang Moo are treating him eventhough he tried to explain that he is so in love he would rather die than leave. Unfortunately there is no way Kang Moo would under because he cannot feel love.