각본이 · 각본을
screenplay, script; (figurative) a set plan
Example
그 영화는 감독이 직접 각본을 썼어요.
The director wrote that movie's screenplay himself.
Word parts
각 role+본 book
Literally 'role book' — the text actors perform from.
Good to know
각본 없는 드라마 (a drama without a script) is a common phrase for an exciting real-life sports game.