Actually, when you think about it. Seonho is an amazing dude to fix things on the very day they argued. If this were any other story, it would have dragged on for days or weeks. It was late at night, he had a revelation after the email-- he rushed all the way to his house because he wants to talk things out.
I know you said your opinion is based on the current chapters but I'll add this tadbit of info to disprove a point. In the raws (in the next chapter), Seonho was asking why Muyeong turned off his phone. Muyeong said his phone battery was dead. This means Seonho was trying to contact him on that very day.
is being a fucking bitch