Childhood Lovers [BTS jimin and TWICE mina]

Jimin and Mina were dating for two years.. Then one day jimin called mina to come to the park..

"Im sorry" jimin said when Mina arrived.
"Why are you saying sorry?"Mina asked
"Im breaking up with you."Jimin said while looking at her with no emotions
"W-what? B-but why?" Mina said with teary eyes
"Just...... Im sorry I have to go" jimin said and left mina alone crying

mina is crying and she don't know what is going on while she is walking because she is thinking about jimin.. She dont know that theres a car coming to her and no one so her crossing so she got bumped.. When she got to the hospital the docter said that she lost her memories.. The driver of the car named Momo called Mina's parents and she is the one who paid Mina's bills too..
When mina woke up she can't remember anything so Momo and Mina's parents help her to remember but they not tell her about jimin..