The more he tries to change to the future the more it seems the timeline is already set. For instance, when he tried to save his mom's restaurant but was surprised when she died. Either it happened earlier than last time or no matter what he does the timeline will remain set
He knows the future he came from but he can’t predict how things will evolve in his current timeline. He saved…
pertaining his mom's death, I'm wondering if it happened earlier this time bc he seemed really surprised when it happened. Or could it be a case where its as you said he thought if he solves that problem then his mom would've lived
So far it seems all the family's success is owed to Yoon Hyun ...so sad he had to suffer from thr family he may as well have made wealthy...but then again if its really time travel then it all had to happen to get to the rebirth...maybe it will be like sisyphus where they are in a loop cuz i think he was the one that ordered his own death to get reborn...just a theory tho