Here's my reply to your opinion
I hope you don't jump into the show with some expectations of a cliche romance.
He looks like a baby in the body of an old person when he smiles. I love him. Oh and there's a romance tag and (minor spoiler)if u 've watched the latest episodes you would know that there's nothing creepy about it yet. Before rushing into the drama with your own expectations I would like you to direct towards the review of Redm apple where she says: Before anyone says our male lead is too old let me redirect you to Ji Sung's profile page. Ji Sung might look like a baby duckling but he's still a mature man in his forties. Also, our 'potential' couple has 14 years gap, but that's not a new thing in a kdrama world now, is it? Furthermore...female lead being 31, she's a mature woman herself.
Oh I find him attractive. Considering his age he looks like a puppy that you can pet all day long especially his smile. It's my first time watching him and if this drama continues with the same pace of the first few episodes (his acting is Superb) He ''ll be my second favorite actor after Jung Hae In. (SITR) all-time my favorite.
Oh and as a person with suicidal tendencies(for the past few months). I love these types of healing dramas coz somehow they end up healing me a little.
Sorry again if my comment offended you.