I'm pretty sure the title "No Moral" alludes to the job as a lawyer itself. Sometimes lawyer has to do morally ambiguous things or straight down immoral to win a case. But so does the other parties. Basically everyone involved in a lawsuit is going to go all out to make sure their side win that it blurs all kinds of morality out of the battleground.
Moral in itself could also be define as "a person's standards of behavior or beliefs concerning what is and is not acceptable for them to do." In this story, we can see that Seheon is someone who always stand by his morality and ideal except when things involved Yoonshin, which is uncharacteristic of him before. So it can also alludes to the relationship of Seheon and Yoonshin itself, where their involvement with each other seems to be something of "No Moral".
Anyway that's just my personal interpretation but feel free to connect the lines as you see fit haha (=・ω・=)
before i read it, pls someone tell me the correlation of the title and the plot.. pls, bcs im.. worried..