Season 1 of "No Boundary" ends rather abruptly and Season 2 is a direct continuation, so if you plan on watching this, be sure that you have access to both seasons.

In Season 1, the story is very nicely developed and paced. One event leads to another, so the apparent villain at the start does not remain the villain throughout. The events are intricately linked, with no abrupt shifts in the plot.

There are some allusions to classic tales and figures like Justice Bao, with the names being transformed. I'm not sure why though. The main male character, Zhan Yan, is an obvious allusion to the constable in the Justice Bao tales, Zhan Zhao. But this isn't a series about court cases in olden China but a series about immortals, mortals and demons. Still, there are elements of sleuthing in this series, and Zhan Yan is a brilliant detective in his own right.

The immortal/mortal romance in this series (both Seasons 1 and 2) is nothing new but very touching. There is some ambiguity about whether the immortals and mortals can actually fall in love in the world of this series. It is mentioned that immortals are not supposed to fall in love. However, the main reason Duanmu Cui is not "allowed" to fall in love with Zhan Yan (or anyone else) is that this would awaken her repressed memories and cause her to do something that, according to an old prophecy, would endanger the world. Of course, we know quite early on that this will happen. But the series does well in slowly unraveling the details.

Though the story really ends in the middle of nowhere in Season 1, the story is interesting and the characters are portrayed in a way that would make us care about what happens to them next, so Season 2 has a secure audience base.