This was Ye Qiu's choice after careful consideration. From the looks of the current situation, letting the underground city invest was a very correct thing.
Moreover, there were only pros and no cons!
The foundation of the Heavenly Courts had yet to stabilize. In this unstable era, it would really be dangerous once it attracted the attention of the powerhouses of the Heavens.
However, if they let the Underground City invest in them and the other party offered excellent conditions, with a Infinite Martial Monarch as their background, those so-called Immortal Ancient powerhouses would probably not have the ability to easily touch the Heavenly Courts.
Therefore, Ye Qiu's choice wasn't wrong. Moreover, the conditions offered by the underground city were nothing more than adding another path to the advancement of the original Heavenly Courts Examination.