Do Chinese L Visas Require the Roundtrip Ticket Evidence to be to One's Country of Residence?

I am going to be travelling in South Korea, and would like to visit China. However, I'm not quite sure of the dates that I will be flying to and from Seoul yet.
According to the Chinese Embassy, in order to apply for an L visa I need to provide (among other things):
Documents showing the itinerary including air ticket booking record (round trip)
I currently reside in London and would be getting the visa here. Could I just provide evidence of a round-trip ticket from Seoul to Beijing and back, or will they require me to provide copies of my tickets to Seoul from London and back as well?
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What do I need to bring for Chinese visa appointment?
Tourist Application Requirements for a China VisaWhy would a Chinese visa be denied?
The applicant is from a country where war, terrorist attacks, or political unrest frequently happen, or whose nationals frequently overstay their visas, or a country with strained relations with China. The applicant has a criminal record.Do embassies know about visa refusal in other countries?
The embassy doesn't track your refusal, CLASS does. That's a database accessible to every American consular officer in the world at the click of a mouse, so it's not just the embassy where the visa refusal takes place.Can I apply for a Chinese visa outside of my home country?
Can you apply for a Chinese visa in another country? While it is possible to apply for Chinese visa outside home country, you may run into more difficulties compared with applying from your own country. Some consular offices do not accept applications from temporary visitors in the country concerned.Foreigners Visa requirements for China 2021
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