This is a drama tackling very serious topics that affected China in 1911-1912. Following the Xinhai Revolution and the end of the Qing Dynasty, there is political and civilian unrest. Hence, as Viki states, this is a drama. Not a comedy. Not a romance. A real drama. And a very good one.
(China lost against Japan in 1895, and since then, Japan and Russia gained some influence in China…, for Japan esp. in Manchuria, Mongolia and Shandong , which significantly reduced the Chinese people's trust in the empire, fueling Chinese nationalism. The sentiment was strengthened by the failed political reform, where the desire to form a constitutional monarchy resulted in the establishment of the Prince Qing's Cabinet with the majority being part of the imperial family in May 1911)
The « 21 demands » mentioned was signed between 1915 and 1916. It would result in a long-lasting animosity nationwide towards Japan. (Resulting in boycott etc)

That is the context of the drama.
It isn’t clearly told at the beginning, but I believe foreign viewers will gain in appreciation of the drama if they know that before starting to view it.

Because of that, the drama does show violence, and deaths.
Very smartly, the underlying dark tone is counterbalanced, as the drama follows the events and topics of importance at that time through a group of military students in their daily lives at a military academy, bringing some light and funny moments, esp. since they introduced a FL disguised as a man as part of the military students…

For me, the drama starts showing its true Colors and intentions starting ep. 15. From then on, it is very well paced.

The production and cast are outstanding. The storyline very well thought.
Special shout-out to Xu Kai who brings life to a welcome witty and shining character, very smart and caring under the presence of being carefree, self boasting and mischievous,…(he proves his versatility with this drama, displaying the wide range of emotions and expressions required by his character and his growth along the drama)
My second shout-out to the 2nd main FL playing the role of the singer/actress, awesome Wu Jia Yi, who stole the show in an unrequited love with Xu Kai.
I normally love Bai Lu (esp. in « one and only », « forever and ever », in which she’s just perfect. Here, she’s good but not the star of the show, wincing a bit too heavily at Xu Kai. I would have loved a bit more subtlety in her acting expressions in these moments, Also I am not fond of the indecisiveness of her character pertaining to her love interest between the 2 ML. She makes XK’s character suffer and I surprised myself thinking at some point that she doesn’t deserve his love… the good thing is that it happened in the very episode where she ultimately realised her true feelings (ep. 38)

Because the love stories are all unrequited during majority of the drama, however lovely it is often tackled, for those seeking first and foremost a fully blossomed romance drama, this is not for you.

Spoiler: Xu Kai’s love for the FL remains unrequited almost until the end (watching him falling in love and expressing his love is nonetheless a real treat. You will root for him)…. All other love stories are also unrequited during the majority of the drama. Because this is first and foremost a historical drama that chose to alleviate its darkness by balancing it with lighter moments, I get it that Fully blossomed romance would have been out of place. We however get good closures in the end, as two couples mixed in unrequited love go to their « right » partner in my opinion (they were too blind and immature to see and understand during the majority of the drama however …)
A great watch.