Both have very solid fantasy plots related to folktales and urban legends

Both are stunningly good dramas dealing with human emotions like rollercoasters.

Both have characters you fall in love with.

ok, it's only 6 ep on Sword Snow Stride and I might edit this later, but for now : I enjoy this serie as much as I enjoyed Nirvana in Fire (and that's a huge compliment as NIF is my fav chinese drama of all time haha)

The mood is heavier and more "realistic" in NIF and the story isn't the same, but in both series you have solid plots, built stones after stones,and it's a real pleasure for the brain.
Characters are slowly appearing and they all are promising.

I feel some kind of similarities in the atmosphere...

The relationship in One Ordinary Day between the ML and the king of the prison made me think about The merciless (but we'll have to see how the drama evolves haha)

Both take partly place in prison, where traficking and violence is pregnent.

One Ordinary Day is a lot darker than Prison Playbook (this one can make you laugh a lot... and cry too haha).
As One Ordinary Day is at it third episode today, I can just say I love both series :)

I don't know where "one ordinary day" is going as it's ep.3 today, but it has good common points with the movie "The trial" :
- a young nice guy accused from murder
- a quick (and wrongful) sentencing leading him to jail
- a clumsy lawyer who fights for good and bad reasons, to innocent him

(I love both btw :))