MU: HND - MAD RT business €1731

This is China Eastern, reasonably short layovers. Price is available on Booking.com however on airline website it shows 3000+ euro. Booking class I which gives from 125% to 295% depending on your status and loyalty program. I just found this one fare, and it doesn't always show. Considering that official site shows double price I assume it won't be available for too long. Shangai Airlines operates leg between Tokyo and Shanghai. I do not see if this includes a lounge however Google flights…