You’re a bad liar.
Informal: 서투른 거짓말쟁이야.
The reason I didn’t put the informal polite phrase, too… is if you’re going to be saying something like this, you probably shouldn’t be saying it to someone you don’t know.
Informal: 서투른 거짓말쟁이야.
The reason I didn’t put the informal polite phrase, too… is if you’re going to be saying something like this, you probably shouldn’t be saying it to someone you don’t know.