This sounds like an intriguing premise for a fantasy K-drama, and on that genre front cable network tvN also has a solid track record. The network is prepping for a K-drama in early 2018 called About Time with an offer out to Lee Sung Kyung to be the female lead. Her character is named Michaella Choi and is a backstage assistant in theater production and has the ability to see a human being’s life expectancy. She can see everyone’s life clock except her own, and the male lead does’t any particular superpowers other than he can stop her time. As they fall in love, time pauses or speeds up or even stops, and only when they are in love does this time magic happen. The drama comes from the PD of Phantom, Secret Door, and Second Time Twenty Again with a script by a new screenwriter.