Webtoon Title Help

Had a shounen ai we took that I forgot the name to…what I recall of the plot was a sheltered, imprisoned boy (by his mother?) and another boy acting as a playmate in his household who tries to help him escape, and the two of them ride a bicycle and fall off a cliff. The escape plan failed and they met again when they were older as the second boy tries to uncover the secrets of the imprisoned boy’s household. Does anyone remember