I have zero idea why this drama is getting this much hate just because a ship failed. This is a normal kdrama with very warm and cosy plot. And I don't think it should be considered as a business drama and yea maybe be the IT industry portrayed here is flawed well who cares. This drama definitely has some heartwarming moments and shows us how kindness will always be repayed in some way or the other.
Han Ji Pyeong and Seo dal mi - yes hjp was sdm's first love but that was not the case for HJP. Her letters were comfort for him too but he left and never looked for her. And then later whatever he have done for her was to repay halmeoni's kindness. And in that process he fell in love with her.
Now coming Nam do san and seo dal mi.. Even though he never had any kind of history with her he started loving her from the very beginning. Much before HJP even realised his feelings.

If you keep aside the strong second lead syndrome because oh my god Kim Seonho and his charm is too great to ignore but still this drama doesn't deserve the hate it's getting now. And yes it's highly recommended..