Looking for a manhua I forgot – reincarnated MC, ancient clan, "Rank 0" heir, dragon & phoenix arcs

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I've been trying to find this manhua for a while but can't remember the title. Some of the details might be slightly off since it's been a long time, but these are the things I remember:

- The MC is a reincarnator from Earth who is reborn into a prestigious ancient clan.

- When he is born, there are heavenly manifestations/omens that make everyone believe he's a once-in-an-era chosen one.

- His grandfather or one of the clan's ancestors breaks tradition and appoints him as Rank 0 (Zeroth Rank) instead of Rank 1. I remember this being a really unique plot point.

- As a child, he takes a strength test using a stone monument/device, and I think he either cracks or completely destroys it.

- A yellow-haired girl who is related to him (possibly a cousin or from a branch family) pledges her loyalty to him after witnessing his talent.

- Another girl looks down on the MC and instead supports another heir with a lower rank. That heir eventually tortures her and sends her to the MC as an apology. The MC later has her banished to a distant place.

- During one festival/celebration, the MC sneaks out into a town instead of attending. He gets into a conflict with a girl who later turns out to be his fiancée when they meet again at the banquet.

- On one of his birthdays (or coming-of-age celebration), he kills a young dragon that was being manipulated by an ancient dragon.

- There is another arc where he saves a Phoenix-descendant empire from a Blue Dragon descendant who is possessed or guided by the lingering soul of an ancient Blue Dragon. This Blue Dragon descendant becomes a recurring rival throughout the story.

- I also remember a yellow-haired woman who falls completely in love with the MC and believes basically everything he tells her.

- The latest arc I remember takes place in the yellow-haired woman's kingdom, where the MC and the Blue Dragon descendant are competing over both a legendary sword and the woman's hand in marriage.

I'm not 100% sure about every detail, and I may be mixing up a few events, but the "Rank 0" designation is the part I remember most clearly.

Does anyone know what this manhua is?