Convenient and kind of mediocre. After trying the first episode, I wasn't convinced it would be worth giving the rest of the show a chance.

The character writing starts off pretty well, with drama is pretty basic, and Cha's relationship with his nephew is a great set-up, but it's unable to maintain this level of strong writing.

The spycraft isn't all that impressive. [spoiler]In order to cover up a phone call to the airport police call centre reporting a vague threat against the airplane, the bad guys immediately set off a fire alarm and within seconds, before there's a chance for anyone to talk about anything, there are call centre operators screaming in the hallways (these are supposedly trained police officers too!) and the operator who handled the call is assassinated before she can tell anyone. How do they know who took the call? If they're capable of all that, wouldn't it have been easier to just cut off the call? Nah. Murdering a police officer in plain sight is easier. Plus the assassin looked pretty cool![/spoiler]

Also, how can you freeze what looks like be a 5L cylinder of compressed oxygen by spraying it with maybe 500mL of liquid nitrogen? Why would freezing it increase the pressure inside the cylinder? Why does this make the cylinder explode like a bomb? [spoiler]How did the explosion take out the engine of a plane?[/spoiler] Why is Cha immune to gravity?