Earlier, Hari Singh used his "appealing smile" as a deliberate tool — a calculated act to win Anil's trust and gain entry into his house. It was a conscious, manipulative gesture used for selfish motives.
At the end, however, the smile "came by itself, without any effort." It was natural and spontaneous — born out of genuine warmth, gratitude, and relief. Hari had returned the stolen money and chosen honesty and education over crime. The smile now reflected a changed heart, not a thief's trick.
Source: The Thief's Story, The Theft and Its Aftermath
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The examiner looks for a contrast between the two smiles — one deliberate/manipulative, one genuine/spontaneous. Quote or paraphrase the line "the smile came by itself, without any effort" for full marks. Link it to Hari's inner transformation (choosing education and trust over theft). This earns all 3 marks.