How many movies have Akiko Yajima and Kim Kyung-suk collaborated on?

They have worked on 4 movies together! Their first movie together was Crayon Shin-chan: Fierceness That Invites Storm! Operation Golden Spy (2011) while their highest rated movie together was Crayon Shin-chan: Intense Battle! Robo Dad Strikes Back (2014). They have not worked together since Crayon Shin-chan: Invasion!! Alien Shiriri (2017). They are most known for their animation films together.