Well that's a real question, how much more expensive is it against Ltwoo, for reference I'm in France, and I can have a 105 DI2 for around 800€, considering it's a full group, with cranks, cassette, chain. Ltwoo on the other hand, offers fewer parts, and still 530€ for an ER9 V3 or 630€ for eRX, how much cheaper is it in reality? And in your opinion what are the pros and cons for each ones ?

Thank you for your question! South Korea is notorious for its consumerism and Import taxes(Korea Certification Mark). Comparing the groupset bought from AliExpress and one from authorized dealer or a bike shop, the difference is quite significant. The cheapest full shimano 105 2x12 di2 I could find localy would send me back 1,530,000 KRW(which is 1124 USD roughly), and AliExpress one with taxes would be roughly 1,150-1,200,000 KRW. This difference is quite to be concidered because I have to take the bike to the shop beacuse I have no idea of how to build the bike, I'm just knowledgable about the specifications.