Technically I would say they weren’t supposed to be soulmates, yeah. Because Yeon forced their fates together with the stone in their previous life—something must’ve occurred in which either person didn’t fulfill whatever was needed for it to be solid—and caused Kihoon to have bad luck in his current lifetime . The string that faded with the girl, that chick must’ve been Yeons actual soulmate, and I would think cus of what happened in their previous life it’s like a “forceful force” that makes both Kihoon and Yeon fall in love at first sight.
I also have a feeling that the app is actually trying to get them apart because Yeon wish for everything to be over; and with Kihoons bad luck, it could get one of them killed
huhuhunoo
huhu I have my theory that yeon-ah is not his hyung soulmate like literal, I need explanation pls pls pls plsszzz