Honestly, I think that your intentions are really great. Make Tae smile again ? Sure !! We're all in ! ♥️
But the fact is, things are a little different from what you say. He does smile, he does laugh. Indeed, he doesn't play dumb as much as before, but this is the consequences of him growing up and maturing throughout the years. This is normal.
The period where he truly didn't seem great was in the last years (2017-18) but not now anymore. He had then lost his grandmother, two of his best friends, it was a hard time for him, thus for us too.
I am not criticizing your actions, just differentiating facts from impressions and a biased way of looking (biased in a good way ofc lol).
Purple you <3
-Spring.