 After finishing his studies, ML Pin accompanied Princess Kalyanga Sombati Kitiyakara on a one-month trip in Europe. Upon return to London, he attended the First World Conference on Adult Education on behalf of Siam, but during the same time his health deteriorated further, and he was diagnosed with tuberculosis. Accordingly, his return trip to Siam had to be postponed in order for him to recover in Switzerland. There he spent almost two years in Davos and later Klosters, until September 1931 when he attended the League of Nations annual conference before returning to Siam via a Nippon Yusen ship departing from Naples, Italy. He finally arrived in Siam on 23 October 1931, after spending over nine years abroad.
