I thought it was Seven Days http://www.mangago.me/read-manga/seven_days/. But I'm not entirely sure. It could have been Only the Ring Finger Knows http://www.mangago.me/read-manga/only_the_ring_finger_knows/. It could have also been Running On Empty. http://www.mangago.me/read-manga/running_on_empty/
I honestly don't know for sure. It's been more......
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