Yang Minjae(you)
[This doesn't have to be your face, it's for the people who feels more comfortable reading with a face in mind]
Yang Su-heyok
(Your younger brother)
Yang Jingwo
(your mom)
Yang Sungmin
(Your dad)
Kang Tae-moo
Cha Sung-hoon
Shin Hari
Jin Young-Seo
Mr. Kang
And all the side characters
are them self.