Yi Chan been emotional thru this ep, first he felt guilt towards Cheong Ah then towards his son, he set things right with Cheong Ah, hope he gets a chance to set things right with Eun Gyeol too. I really hope they don't drag out the disappearance.
so his dad loose his hearing not matter what, in this version it's because Yi chan went looking for Eun Gyeol,…
I saw someone comment that him returning back to the present was a dream. If not, he'll probably return to the past in the next episode or next week's episode
It’s kinda bizarre that his reason for traveling back in time is to stop his dad from becoming deaf, there is…
I have a feeling that he won't be able to change the fact that his dad becomes deaf tbh. I also think that HE thinks his 'mission' is to change his dad's fate, but the real 'mission' may be for him to learn more about his parents & learn a few life lessons tbh. We've already seen him reflect on a few things which may help him in the future. Idk if what I said makes sense but yeah I agree with what you said - nothing wrong with being deaf & they do seem a happy family even without their hearing. It's Eun Gyeol who struggles a bit, being the voice between his family & the world, but the mom, dad, and Eun Ho don't seem upset about not being able to hear.