Fated To Reunite [Yang Jungwon]

The two lovers, Jungwon and Eunha, meet in their past lives during an epic battlefield. Despite their circumstances, they fall in love and make a promise to find one another in their next life.
Years later, as Jungwon and Eunha are reborn into different bodies, they live their lives unaware of their past promise and continue on with their respective stories. However, fate has something in store for them as their souls still long to be reunited.

(Note: I am still in the process of stanning Enhypen, so I apologize if there are some incorrect information.)