WI: A Luzon based polity? it's cultural sphere

I am not asking how a Luzon based polity or an Independent Luzon will be established because I already know how, I just want to know what culture sphere would it likely belong is it on the Sinosphere or the Indosphere
 
Really depends on its cultural roots. Does it look towards the Indianised kingdoms south of it or towards China to the North?
 
Really depends on its cultural roots. Does it look towards the Indianised kingdoms south of it or towards China to the North?
It looks on both because both Traders from Sinosphere and Indosphere would trade with it, I know that there will be both influences from the two Cultural Spheres I just want to know what will be the dominant cultural influence and Cultural Sphere.
 
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