What is the cheapest eSIM for China mainland & Japan & South Korea (3 countries)?

The 1 GB plan for 7 days, at $3.99.

What's the longest plan?

Up to 30 days, depending on the plan you choose.

Yes: at least one partner network (China Unicom, KDDI/au, SKTelecom) offers 5G. On a phone without 5G it runs on 4G.

Yes, from $1.99 a day with 500 MB a day, for up to 30 days.

Land in China mainland & Japan & South Korea (3 countries) already online, no Wi-Fi hunting

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Data	Valid for	Price	Per GB
1 GB	7 days	$3.99	$3.99
3 GB	15 days	$7.99	$2.66
3 GB	30 days	$8.49	$2.83
5 GB	30 days	$11.99	$2.40
10 GB	30 days	$18.49	$1.85
20 GB	30 days	$30.49	$1.52

You can start with 1 GB for 7 days at $3.99.

Heavy user? The 20 GB plan brings a GB down to $1.52.

China mainland & Japan & South Korea (3 countries) has 6 plans: 1 GB to 20 GB, lasting 7 days to 30 days.

Daily plans start at $1.99 a day for 500 MB a day (then 384 Kbps).

It connects to China Unicom, KDDI/au and SKTelecom, with 5G where the network offers it.

One plan covers 3 countries.

What is the cheapest eSIM for China mainland & Japan & South Korea (3 countries)?: The 1 GB plan for 7 days, at $3.99.
What's the longest plan?: Up to 30 days, depending on the plan you choose.
Is there 5G in China mainland & Japan & South Korea (3 countries)?: Yes: at least one partner network (China Unicom, KDDI/au, SKTelecom) offers 5G. On a phone without 5G it runs on 4G.
Are there daily plans for China mainland & Japan & South Korea (3 countries)?: Yes, from $1.99 a day with 500 MB a day, for up to 30 days.
Which networks does it use in China mainland & Japan & South Korea (3 countries)?: China Unicom, KDDI/au and SKTelecom.