Need help finding the name

Time loop yaoi manhwa w full color and max 5-12 chapters. If I remember right seme is a royal and kills his family member for the throne. Then gets teleported near a fountain where he meets the adult uke and they fuck while making some wish to always find each other?? He gets sent back to his timeline and goes to find and rescue a kid version of the uke. Then for years has him stay at his mansion, without touching him or telling him anything. Seme is like middle-aged by now and fresh 18yr old uke is pining over him. Ukes advances are always rejected so in frustration he runs away for a bit and comes across the same fountain. Appears the young seme who js murdered his family and the loop starts again. Thanks.