Let’s say the two of you have a million dollars, all of it acquired during the marriage. (I don’t think it legally matters whose account it’s in–that is unless the money is in a foreign jurisdiction.)
Your spouse dies. Half of the money is yours anyway, so 1/2 million. Plus you inherit half of the spouse’s half, for an extra 1/4 million–putting you up to 750,000.
Normally the remaining quarter million should go to the entitled heirs, if any. However, this amount can be reduced if your spouse writes a will. If the entitled heirs are the spouse’s parents, then their amount can be reduced by half, to 1/8 million,leaving you 875,000. If siblings or grandparents, it can be reduced by 2/3, to 1/12 million, leaving you…ah, 916,667.
(Conveivably, the spouse might also reduce your share by half.)
Interesting things happen when not all the assets are in Taiwan. Let’s say you have another million in a foreign bank account, in a county which automatically gives you the money. Will a Taiwan court take this into consideration, when determining the disposition of the million dollars which is in Taiwan?