This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
When Koichi cracks a lame joke, Viet gets in a bad mood.
Hey, don't make such a sullen face. Let's have fun!
I went to bed late last night and had to get up at five in the morning, so I was grumpy all day today.