Modi said the path is tough but he knows how to leave an indelible mark. "We have embraced that path. The solution to all problems is development," he said.
"There was a time when people left India saying country is of no good. These people are ready to come back. Mood has changed," the Prime Minister said, adding that India is being seen as the fastest growing economy of the world.
"Your experiences are indispensable for Indian progress," he told the Indian community, describing them as the real ambassadors of Indian history and culture in foreign lands.
Drawing on ancient linkages between the two countries, Modi invoked the legendary Korean King Suro, who is believed to have married an Indian princess from Ayodhya centuries ago.
Citing Nobel laureate Rabindranath Tagore, Modi described Korea as the "lamp of the east".
Prime Minister Modi said human values and humanity should be the focal point of foreign policy and insisted that based on humanism his government has connected the SAARC countries.
Referring to recent crises in India's neighbourhood, Modi said five Indian fishermen were sentenced to death in Sri lanka, but using the diplomatic missions his government was able to save them and bring home.
Stating that India stood firmly with Nepal after the devastating earthquake that hit the country last month, Modi said India rescued hundreds of people including those from 50 other countries.
He also made a reference to strife-torn Yemen from where India evacuated over 4,000 people including foreigners, saying it was because his government believes in humanity.
He said India sent drinking water by ships and planes and aided the Maldives when water crisis hit the island nation.
Modi also mentioned the land Boundary Agreement with Bangladesh, crediting his government for resolving this vexed issue. He thanked all political parties for the passing of India-Bangladesh land Boundary Agreement.
later, he drove down to Cheong Wae Dae, the office and official residence of the South Korean President, where he was given a ceremonial welcome.
Earlier, Modi drove down to the Seoul National Cemetery straight from the airport after arriving here to pay his tributes to Korean veterans.