Sinasina

Ultimately the biggest problem with this drama is that the Soo Min / Woo Shik pairing just doesn't work. There is no chemistry between them whatsoever. I like these actors a lot, but even ignoring the lacking chemistry I feel neither of them tried very hard here. Also Woo Shik feels totally miscast in this calm intelligent role, I don't know.
Beyond that everything else that actually matters is mediocre to a fault and that's pretty much it.

The photography is completely lacking even a hint of creativity. Sure they used expensive gear & have produced high quality footage, but it's lifelessly over-optimized & boring. TV is a visual medium & this matters a lot even if the untrained audience doesn't notice it consciously.