The MC's nickname, good-for-nothing, was coined from his stunted cultivation which was considered an embarrassment as he was the heir to a prestigious exorcist family. This more or less brought about the schemes from the step mother and her children

1) He Jin, the MC's younger half-brother, repeatedly attempted to mu*der the MC. He even started to dip into demonic cultivation which is taboo in their family. He Jin could risk being shamed and disowned if he was exposed. Why would He Jin resort to extreme measures that could backfire on him when there is no clear benefit? Even the step mother opposes this scheme, but she's mostly unaware of her son's activities so far.

2) A Jade Pendant was discovered sitting alongside the ashes of the MC's mother in the cinerary casket it was kept in. It was explained that this pendant was made into an evil vessel that absorbs the residual 'Qi' of the deceased to nourish the owner, Qiao Peiyu, the stepmother. While I agree that it's pretty f**ked up to try to nourish yourself from the dead, why would the step mother feel the need to resort to this taboo method? As a low born woman who got into the family via unsavory methods (seducing the MC's father), her own status within the He family had nothing to do with her cultivation level nor will it help her gain any legal claims to the He family property.

3) A second purpose of the jade pendant is that it stunted the MC's cultivation. It was hinted that she intends to have the MC mu*dered. If the stepmother stunted the MC's cultivation to make him easier to kill, then isn't she causing her own shortcomings by marrying him off to the most powerful character. To make matters worse, the MC recovered his cultivation by breaking that pendant, effectively negating the jade pendant scheme.

4) The marriage was devised by the stepmother. She wanted to marry the MC off to another family so that the MC would have less claims to the He family property. Her objective seems to detract when He Yu, her only daughter, takes interest in the ML. She even comments that if she had known that He Yu would be interested in the ML, she would've tried to marry her off instead of the MC. The stepmother even starts devising a scheme to have He Yu seduce the ML. If that was the case, then what was the purpose of marrying the MC off to begin with?

5) The Welkin Upender is the He family heirloom that is given to the first son. By birthright alone, only the MC has the right to inherit it because he is the son of the first wife. Any scheming from He Qin is pointless because he was born from the second wife, the stepmother, even if he is the firstborn son of the He family. I don't see how colluding with He Jin to manipulate the MC into ruining his father's birthday party would get him closer to inheriting that heirloom. It makes even less sense for He Jin to be resorting to demonic cultivation since virtually has no chance since he's than the other two.

it was mentioned tht HZ 1st kiss was taken by LZ n he's a virg*n- coz he's a clean freak. Then later - "In the past, when he had been with previous partners, he had seldom had s*x with them. Most of the time, they had used hands to give him s*xual pleasure".