Dahyun, the casting article that came out earlier has an official statement

[OSEN=Reporter Kim Chae-yeon] Dahyun of group Twice is considering an offer to play the lead role in the Korean version of the film 'The Girl We Loved Back Then'.

On the 13th, an official from JYP Entertainment, Dahyun's agency, stated to OSEN regarding the casting for the Korean version of the movie 'Back Then, The Girl We Loved', "We have received an offer for the work and are currently reviewing it."