lishaoxuan wrote:I noticed that there are a lot of "yo" at the end of sentences. Is it simply an interjection or does it have some concrete or grammatical meaning？
"Yo" is a honorific ending.
-Hada ("To do", basic form)
-Hae (informal, impolite)
-Haeyo (informal, polite)
-Hamnida (formal, polite)
-Hao (formal, polite among equals - almost extinct)
-Hashinda (formal, polite referring a superior; never first person)
etc. Korean verbs change according to honorific and mood; e.g. declarative or imperative.