He was sired by Kodiac, a sprinter who won four minor races from twenty starts and finished second in the Hackwood Stakes and fourth in the Prix Maurice de Gheest.

[2] Like his full-brother Invincible Spirit, he became a very successful breeding stallion, siring many major winners including Tiggy Wiggy, Fairyland and Best Solution.

On 22 August at Carlisle Racecourse the colt started 9/4 favourite for a six-furlong maiden race and made a successful debut as he took the lead a furlong out and drew away to win by four lengths.

On 13 October the colt was sent to France and stepped up in class to contest the Group 2 Critérium de Maisons-Laffitte over 1200 metres on soft ground and started the 6.4/1 fifth choice in an eight-runner field with his more fancied rivals being Sporting Chance (winner of the Prix Eclipse), Legends of War (second in the Gimcrack Stakes), Queen of Bermuda (Firth of Clyde Stakes) and Graignes.

After tracking the leaders, Hello Youmzain went to the front 200 metres from the finish and despite hanging to the left he kept on well to win by two and a half lengths from Queen of Bermuda.

[7] In the official 2018 European classification for two-year-olds Hello Youmzain was given a rating of 114, making him the tenth best juvenile colt, 12 pounds behind the top-rated Too Darn Hot.

[8] James Doyle took the ride when Hello Youmzain began his second season in the Greenham Stakes, a major trial race for the 2000 Guineas, run over seven furlongs at Newbury Racecourse on 13 April.

He started the 5/2 favourite but was unable to quicken in the closing stages and came home fourth of the eight runners behind Mohaather, Great Scot and Urban Icon.

[11] After a break of two and a half months Hello Youmzain returned on 7 September for the Group 1 Sprint Cup at Haydock, a race which saw him matched against older horse for the first time.

Racing on heavy ground he led for most of the way after being overtaken a furlong out he faded badly and came home eighth behind the 33/1 upset winner Donjuan Triumphant.

The flat racing season in Britain and Ireland was disrupted by the COVID-19 outbreak and Hello Youmzain did not make his reappearance until 20 June when he was ridden by Stott and started the 4/1 second favourite for the Diamond Jubilee Stakes which was run behind closed doors at Royal Ascot.

He disputed the lead from the start and gained the advantage inside the last 200 metres but was overtaken in the final strides and beaten half a length into second place by Space Blues.