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What needs to be realized is how Sihwa always acted thinking only for himself. He's all way being happy about bringing Sohan into their planet when he eve didn't ask him first in the first. He always make a decision first and not even asking Sohan if he's okay with it, Sohan, unfortunately, just did what's being ask to him because what he wanted was a company even if he wanted to dent that fact. Now, who needs to teach who a lesson?

I mean... he's literally an alien with no knowledge of how to be a human. Sohan is a human who knows full well how to word things in a way that may help Siwha understand. Sohan distanced himself because he's afraid of getting close, so yeah I agree that he's the one that needs to come to terms with how he feels.