Byung Ho drunk because he thinks it's cool and you will probably love it even more him, he doesn't really want to get drunk but seeing other guys drunk so he does too, to make him look strong

Byung Ho buys red wine secretly so he won't get scolded by you, he has already finished 4 glasses tonight

"look... I'm strong, I can get drunk!!"

Byung Ho said incoherently because he was so drunk, he looked innocent when he was drunk