A Bazi Chart with Pure Yin? But I Know the Secret Art of Yin and Yang!

[Urban] + [Secret Legacy Techniques] + [No Mindless Protagonist] + [Fast-Paced Plot] Yin-Yang secret arts, eleven levels of cultivation. Kaiyang, Tianquan, Tianji, Tianxuan, Yuheng… Breaking through each level is a key to shattering the shackles and constraints of life. Dong Quan, the sole surviving member of his clan with a completely Yin Eight Characters birth chart, must uncover a secret sealed away for a hundred years. How will he do it?