J.L.
People with Asian ancestery can and usually do have yellow undertones. This is not unusual. If you have the benefit of meeting a wider cross section of people from this part of the world, you would see yellow skin undertones are not unusual among people from places like Persia, Indonesia, India, Malaysia and so on... They (we) do not all have very dark skin, nor do they all have "tan" skin.
I have Filipino ancestry and family members range from very dark brown to high yellow in skin tone. Pretty common.