Hello! I'm trying to remember the name of a Korean drama I watched years ago that I want to re-watch. It was a cable drama about a couple with a son who later divorce, the father loses contact with his ex-wife and son, goes on to remarry and have another son with his new wife. The first son locates him and moves in with his dad, his stepmom, and his little half brother. The oldest son is sick (I think with cancer) and his half-brother is a perfect match for a bone marrow donation. The oldest son is a high school student and his half brother is in elementary school, they also gradually become very close. I think the oldest boy was into airplanes?? I believe the main plot is the oldest son's mom trying to get him back, but I'm not entirely sure. Would love any help!
