Same director, similar set up and premise, better executed. If you like NLMG you will love 3WBF and if you dislike NLMG then 3WBF will deliver on everything you are disappointed about in NLMG.

Edit: Jojo Tichakorn the director also confirmed that these two dramas take place in the same universe! There was supposed to be a crossover in NLMG where Shin became a cameo mentor to Neungdiao but it was eventually scrapped for time.