勧善懲悪
Common
Noun
1
noun (common) (futsuumeishi)
yojijukugo
rewarding good and punishing evil;poetic justice
このドラマは単純な勧善懲悪もので、今一つ深みに欠けて物足りない。
This drama is missing something. All it is is a simple cautionary tale with no real depth.