Could've been 5/5 but lacking something (4/5)

Both high school students and same age
After living in December 24th, Christmas Eve on endless repeat- Mokhwa seems to be the only one who's aware of the existence of the time loop. And on this repeated day, he spends time with his childhood friend 'Choi Gyun' despite having cut ties with him a long time ago.

"2 couples" -> leukemia patient uke x doctor seme (new love) and businessman/partner since high school seme (old love)
Zhishu and Jiang had been together since high school. Together, they started a business and experienced all kinds of ups and downs. Zhishu gave up his career to stay at home, while Wenxu Jiang gradually changed and began to indulge in merry-making. Zhishu got an incurable disease and gradually fell in love with Dr. Ai.