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If a person comes back from a foreign country, there will always be something different. But if you stop moving forward, you will be unfamiliar with both and gain nothing. Don't try to explore too much into the abyss, but use what little abyss you have to open new doors. No matter how strong a person is, he has a past; no matter how weak a person is, he will have a tomorrow waiting for him. Therefore, between the two worlds, you don't have to pursue too much, you just need to keep going. Medicine seekers will meet and break up. Finally, the medicine is certainly not sweet. But it won't be very bitter.