It is about easy, simple and delicious Taiwanese castella, How to make Taiwanese Castella

Thanks to Bong Joon-ho's appearances in the film, he made a Taiwanese castella that is now popular again. Not to mention the soft texture, it's not too sweet, so you can eat a lot. Make it, it's delicious.
recipe
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Meringue; 6 egg whites + 1/2 cup sugar
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6 egg yolks
1/2 cup cooking oil (120ml, 120g)
1/2 cup milk (120ml, 120g)
1 teaspoon vanilla extract
1 cup plain flour (240ml, 145g)
150 degrees (300F) 60 minutes