I happened to be traveling to Yilan, and the weather was super hot, so it was really suitable to have a cup of mung bean paste and milk.
Beimen Mung Bean Paste Milk King is a famous restaurant with queues, but fortunately the queue moves pretty fast and there is a cooling fan next to it, so the queue will not be painful.
This time I ordered the signature mung bean paste milk. The milk is made with yakult and is beaten very carefully. It doesn't have a sandy taste at all. It is denser and sweeter. I personally don't like it that much. I would like to try other drinks next time I have the chance.

I heard it’s a famous online store
There is indeed a queue if you come on a Saturday afternoon
There were about 10 groups of customers lined up and the wait lasted about 10 minutes.
The size of the drink is about the size of a hand-cranked shop cup
Papaya milk tastes like a milkshake without ice cubes
It's very delicious and doesn't turn into a pile of dregs after drinking it.
But it is still recommended to finish drinking early
I highly recommend you buy it if you have time when you are in Yilan.
Great with salty food

Their opening hours are a mystery
Holidays may start earlier
Additional openings on Sunday during summer vacation
Business hours on holidays will be adjusted on a rolling basis
It is recommended that you check their Instagram directly before going there
Or make a call to confirm first!

If you drive there, there are one or two parking spaces or white lines nearby.
Or suggest passengers get off the car and buy a car and drive around.