Despite late drama, victory was well deserved for Liverpool who dominated throughout and bounced back from blowing a 2-0 first-half lead.
Liverpool manager Jurgen Klopp defended Neymar's play-acting at the FIFA World Cup 2018.
Julian Draxler, Edinson Cavani, Angel di Maria and youngster Moussa Diaby all found the net at the Parc des Princes.
Brazil, playing their first international since a disappointing World Cup quarterfinal exit, were in complete control throughout a low-key encounter at the MetLife Stadium.
Neymar had previously served as Brazil's captain at the 2016 Rio Olympics.
Kylian Mbappe risks a lengthy ban after his red card, but he insisted he had no regrets.
German Tuchel, who replaced Unai Emery on a two-year deal, was without a host of first-team regulars as PSG's trio of World Cup winners - Kylian Mbappe, Presnel Kimpembe and Alphonse Areola - showed off the trophy to fans before kick-off.
Thomas Tuchel insisted that Neymar is the "key player" for his side.
There were loud cheers from the 41,000-strong Shenzhen crowd when Neymar was introduced on 76 minutes.
Neymar, wearing a canary-yellow hoodie, posed for pictures with airport staff before his noisy welcome in the arrivals hall.
Neymar was widely lambasted during the FIFA World Cup 2018 in Russia for his theatrical reactions to challenges.
Neymar is yet to return to PSG after the World Cup, where Brazil were stunned by Belgium in the quarter-finals.
This is the third edition of the Best FIFA awards following the end of a six-year merger between the FIFA honour and France Football's Ballon d'Or in 2016.
Neymar seemed in a relaxed mood as he explained his post-World Cup blues.
Neymar, who became the world's most expensive footballer last year after moving to PSG from Barcelona, has repeatedly been linked to a move to Real Madrid.
A thrilling World Cup came to its conclusion as France beat Croatia in Sunday's final at a jam-packed Luzhniki Stadium in Moscow.
Brazil's media has directed sharp criticism at the national football team after their 1-2 quarter-final defeat against Belgium at Kazan Arena on Friday, a result that dumped the five-time champions out of the mega event.
Neymar's diving antics in World Cup 2018 have become the source of a hilarious copycat trend that is breaking the internet.