Original Korean Title: 그녀를 모르면 간첩
Transliterated title: Geunyeoreul moreumyeon gancheob
International Title: Spy Girl

Also known as:
A Spy Girl
僕の彼女を知らないとスパイ (Japan)
https://www.imcdb.org/movie_390043-Geunyeoreul-moreumyeon-gancheob.html

Original Korean Title: 광식이 동생 광태
Transliterated title: Gwangshiki dongsaeng gwangtae
International Title: When Romance Meets Destiny
https://www.imcdb.org/movie_488736-Gwangshiki-dongsaeng-gwangtae.html